Malicious PDF — malware analysis report

Static analysis result for SHA-256 e01d9455d1035ae7…

MALICIOUS

PDF

83.9 KB Created: 2021-09-21 01:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 181b0bcda9cabe70b156905284dac372 SHA-1: 656e18d6b2d5f38d0e8839caf16d06b2c69099ba SHA-256: e01d9455d1035ae7fbcf0bb3db278f7e00ab5c0311bfb317e20f249828ad5988
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to a link farm hosted on disposable domains. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to manipulate search engine results or redirect users to malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://gurolmumcu.com/userfiles/file/wopodudaduzef.pdf In PDF document text
    • https://meritumptt.pl/dokumenty/file/84081199311.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/kanegudutosativodix.pdfIn PDF document text
    • http://erictex.com/ufiles/files/dopot.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/20166721583.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/xudakaze.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/3256257795.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210909160806_73525576.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/manapirikeno.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/nufemapekuvisizej.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/71238490821.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/69974158727.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/zugigabejuritem.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/pudutukixufigabifijo.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/fabipu.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/mawaxofovononematuvo.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/3453148576.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/vinoforovajegijero.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/73148384220.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/varubelejurepolugakozojip.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359e88b8a17---78209173344.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/56501244815.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/56661458119.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=como+resetar+samsung+galaxy+5PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE271 17728 bytes
SHA-256: 468c339b7efafa0ac4b8cace9e38b78bbf0ab03e807881298bdf043a25ff5492
font_01_sfnt_off000110b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CA 10840 bytes
SHA-256: 6c966fa0d084fdeba57732ce08d44bb175407a7dc44f25ca174911b1b51bbb08

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